Super Mario Bros.: The Lost Levels, originally released in Japan as Super Mario Brothers 2 (スーパーマリオブラザーズ2 Sūpā Mario Burazāzu Tsū?) and as Super Mario Bros. For Super Players in Super Mario Bros. Deluxe, is a platforming video game developed and published by Nintendo for the Family Computer Disk System. First released in Japan on June 3, 1986, it is the direct sequel to Super Mario Bros.. A 16-bit remake was released as part of Super Mario Collection in Japan with a subtitle known as For Super Players, which was also used in Super Mario Bros. Deluxe.

The North American and European 16-bit remake, entitled Super Mario Bros.: The Lost Levels was released as part of Super Mario All-Stars for the Super Nintendo Entertainment System (SNES).[1] More recently, the original Disk System version was made available as a download (including North America and PAL regions) for the Wii Virtual Console as of 2007 and the 3DS Virtual Console as of 2012.[1][2] Unlike the 16-bit version, the Virtual Console version is the original Disk System version with all its original subtitles (although like Super Mario Bros., the original game was already entirely in English) without the loading screen.

The premise of the game is identical to Super Mario Bros.: Bowser has abducted Princess Toadstool (Peach) and is holding her captive in one of his castles. Either Mario or Luigi must navigate through the Mushroom Kingdom, overcome Bowser's henchmen, and rescue the Princess. The game uses the same game engine as its predecessor and is quite similar in visual style.[2][3][4] It is intended to challenge players who have mastered the original Super Mario Bros.